Pull Request #5 Bump rack-protection from 1.5.3 to 1.5.5

Bumps [rack-protection](https://github.com/sinatra/sinatra) from 1.5.3 to 1.5.5.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/commits)

Signed-off-by: dependabot[bot] <support@github.com>

 avatar dependabot[bot]

Pull request event #2.1 errored

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The .travis.yml file used for this job is not available
Build Config
{
  "os": [
    "linux"
  ],
  "language": "ruby"
}